Removing extremist content from the internet within a few hours of it appearing poses “an enormous technological and scientific challenge”, Google’s general counsel will say later on Wednesday to European leaders who want it taken down quicker.

Kent Walker, general counsel for Alphabet Inc’s Google, will speak on behalf of technology companies Facebook, Microsoft, Twitter and YouTube at an event on the sidelines of the annual gathering of world leaders at the United Nations.
http://uk.reuters.com/article/us-internet-extremists-speech/internet-firms-say-removing-extremist-content-within-hours-is-huge-challenge-idUKKCN1BV1UI
http://in.reuters.com/article/internet-extremists-speech/internet-firms-say-removing-extremist-content-within-hours-is-huge-challenge-idINKCN1BV297